/** Constructor, registering statically available XQuery functions. */
private Functions() {
for (final Function def : Function.values()) {
final String dsc = def.desc;
final byte[] ln = token(dsc.substring(0, dsc.indexOf(PAR1)));
final int i = add(new QNm(ln, def.uri()).id());
if (i < 0) Util.notexpected("Function defined twice:" + def);
funcs[i] = def;
}
}
/**
* Returns the specified function.
*
* @param name function qname
* @param args optional arguments
* @param ii input info
* @return function instance
* @throws QueryException query exception
*/
public StandardFunc get(final QNm name, final Expr[] args, final InputInfo ii)
throws QueryException {
final int id = id(name.id());
if (id == 0) return null;
// create function
final Function fl = funcs[id];
if (!eq(fl.uri(), name.uri())) return null;
final StandardFunc f = fl.get(ii, args);
// check number of arguments
if (args.length < fl.min || args.length > fl.max) XPARGS.thrw(ii, fl);
return f;
}